Lower Parts
Looking to get new parts for your AR's lower receiver. This is the place to look, with hundreds of parts from stocks and grips to a new mag release button. Shop with Grid Defense to customize and build the best lower receiver you can. Make your firearm look, feel, and perform the best with our selection of OE and aftermarket parts.
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Adaptive Tactical Lightweight Tactical Grip - FDE
$17.99Adaptive Tactical Lightweight Tactical Grip - FDE AR-15/M-16/M4 Pistol Grip Constructed from High Grade Reinforced Polymer One Piece Construction Non-Conductive Ergonomic Aggressive Design Lightweight and Durable Improved...$17.99 -
AR-15 Pistol Buffer Tube Assembly - Blue Titanium
$35.00PISTOL BUFFER TUBE ASSEMBLY - Blue Titanium Made in the USA 1.25" Outer Diameter Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Finished in Blue Titanium Cerakote$35.00 -
Elftmann Ambi Speed Safety - Stainless Steel
$39.95Elftmann Ambi Speed Safety - Stainless Steel Made in the USA Ambidextrous Safety Selector Push Safety Design Includes Detent Extremely Fast On-Off Stainless Steel Mil-Spec Compatible Works with AR15/AR10$39.95 -
KNS Non Rotating Trigger/Hammer Pins .154 G2
Sale: $28.00MSRP: $29.00KNS Non Rotating Trigger/Hammer Pins .154 G2 Non Rotating Hammer and Trigger Pins .154 Diameter Black Finish Compatible with Milspec AR15 ReceiversSale: $28.00MSRP: $29.00 -
MIL-SPEC CARBINE BUFFER TUBE - ZOMBIE GREEN
$30.00MIL-SPEC CARBINE BUFFER TUBE - ZOMBIE GREEN Made in the USA Compatible with M4 Type Butt Stocks 6 Position Machined from 7075-T6 Aluminum Weight: 3.6oz Zombie Green Cerakote Finish$30.00 -
Phase5 Oversized Magazine Release - Black
$21.99Phase5 Oversized Magazine Release - Black Made in the USA Compatible with AR15/AR10 Receivers Compatible with Anti-Rotation Trigger/Hammer Pin Sets Compatible with Extended Bolt Releases Machined from Billet Aluminum Larger Contact Surface than a...$21.99 -
SKELETONIZED ELITE TRIGGER GUARD - FLAT DARK EARTH
$25.99PREMIUM SKELETONIZED ELITE TRIGGER GUARD - FDE This Skeletonized trigger guard is the premium option from the Vital trigger guard that comes standard with all completed lowers. With it's slim design, it offers coverage where it is needed serving...$25.99 -
SPIKE'S ST-9X 9MM HEAVY BUFFER
$49.95SPIKE'S ST-9X 9MM HEAVY BUFFER Lasered spider St-9x 9mm Heavy Buffer Material: 303 Stainless Steel Finish: Raw Weight: 7.7oz$49.95 -
Tactical Dynamics Skeleton Stock - Tactical Grape
$109.00Tactical Dynamics Skeleton Stock Finished in Tactical Grape Cerakote Made in the USA Compatible with Milspec Carbine Buffer Tube Machined from 6061-T6 Aluminum Specs 6 3/4" Long 5 1/4" Contact Area 1 1/4" Wide 9.65oz$109.00 -
TIMBER CREEK AR EXTENDED MAGAZINE RELEASE - BLUE ANODIZED
$19.99AR EXTENDED MAGAZINE RELEASE - BLUE ANODIZED Mag Release in Blue anodized finish Lightweight Made in the USA Manufactured by Timber Creek Outdoors$19.99 -
TIMBER CREEK AR EXTENDED MAGAZINE RELEASE - RED
$19.99AR EXTENDED MAGAZINE RELEASE - RED Made in the USA Red Anodized Finish Compatible with all mil-spec lowers Manufactured by Timber Creek Outdoors Inc.$19.99 -
TIMBER CREEK AR MAGAZINE RELEASE BUTTON - ANODIZED PURPLE
Sale: $7.19MSRP: $7.99AR MAGAZINE RELEASE BUTTON - PURPLE Billet 6061-T6 aluminum Compatible with all Milspec lowers Manufactured by Timber Creek Outdoors Made in the USA Purple Anodized FinishSale: $7.19MSRP: $7.99 -
TIMBER CREEK AR MAGAZINE RELEASE BUTTON - FLAT DARK EARTH
$7.99AR MAGAZINE RELEASE BUTTON - FLAT DARK EARTH Lightweight billet aluminum Choose from a variety of colors Manufactured by Timber Creek Outdoors Made in the USA Flat Dark Earth Cerakote Finish$7.99 -
Adaptive Tactical EX Performance Stock - FDE
$59.99Adaptive Tactical EX Performance Stock - FDE Designed for owner installation Covered take down pin makes installation and removal easier and eliminates discomfort M4-style stock with adjustable length-of-pull Easy to reach rapid adjust...$59.99 -
Adaptive Tactical Lightweight Tactical Grip - Woodland Camo
$25.99Adaptive Tactical Lightweight Tactical Grip - Woodland Camo AR-15/M-16/M4 Pistol Grip Constructed from High Grade Reinforced Polymer One Piece Construction Non-Conductive Ergonomic Aggressive Design Lightweight and...$25.99 -
Elite Tactical Systems .223/5.56 30rd AR Magazine Gen 2 - FDE
$11.99Elite Tactical Systems .223/5.56 30rd AR Magazine Gen 2 - FDE State-of-the-art long fiber polymer provides unmatched toughness and durability Improved feed lip geometry allows better compatibility with more receivers Over insertion tab is larger to...$11.99 -
Magpul MOE-K Grip AR15/M4 - Black
$20.95Magpul MOE-K Grip - Black Compact and Thin Minimalist Design Constructed from Reinforced Polymer More Angled Vertical Grip than Standard A2 Grip Aggressive TSP Texture Weighs 2.4oz Made in the USA$20.95 -
SAFETY SELECTOR - AR15
$9.99AR15 SAFETY SELECTOR Compatible with AR15/M4 Lower Receivers American Made$9.99 -
SB TACTICAL SBM4 PISTOL STABILIZING BRACE - FDE
$129.99SB TACTICAL SBM4 PISTOL STABILIZING BRACE - FDE The SBM4 Pistol Stabilizing Brace was designed to provide increased stability and improved accuracy while firing with one hand. The polymer construction firmly contours to your forearm and while the...$129.99 -
Strike Industries AR Flip Switch - Red
$43.95Strike Industries AR Flip Switch - Red Package includes:- 2x Shaft Screw- 1x 60/90 Shaft- 1x End Cap- 1x Right Side Flip Switch- 1x Left Side Flip Switch Features- Ambidexterous- Ergonomic Shape- Modular Assembly- Strike 60/90 Option Note: Not...$43.95